Synthesis of Si nanosheets by a chemical vapor deposition process and their blue emissions

Ungkil Kim, Ilsoo Kim, Yonghee Park, Ki Young Lee, Sang Youp Yim, Jae Gwan Park, Hong Gyu Ahn, Seung Han Park, Heon Jin Choi

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78 Citations (Scopus)

Abstract

We synthesized free-standing Si nanosheets (NSs) with a thickness of about <2 nm using a chemical vapor deposition process and studied their optical properties. The Si NSs were formed by the formation of frameworks first along six different 〈110〉 directions normal to [111], its zone axis, and then by filling the spaces between the frameworks along the 〈112〉 directions under high flow rate of processing gas. The Si NSs showed blue emission at 435 nm, and absorbance and photoluminescence (PL) excitation measurements indicate that enhanced direct band transition attributes to the emission. Time-resolved PL measurement, which showed PL emission at 435 nm and a radiative lifetime of 1.346 ns, also indicates the enhanced direct band gap transition in these Si NSs. These outcomes indicate that dimensionality of Si nanostructures may affect the band gap transition and, in turn, the optical properties.

Original languageEnglish
Pages (from-to)2176-2181
Number of pages6
JournalACS Nano
Volume5
Issue number3
DOIs
Publication statusPublished - 2011 Mar 22

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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